在代码中检测权限

有时候需要在代码检测是否加了某种权限，然后才执行某种操作，避免抛出异常。示例如下：

package com.home.testpermission;

import android.os.Bundle;
import android.util.Log;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;

public class MainActivity extends Activity {
	// 以访问网络权限为例
	private static final String INTERNET_PERMISSION = "android.permission.INTERNET";
	private static final String TAG = "MainActivity";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.i(TAG, hasPermission(this) + "");
	}

	/**
	 * 检测是否具有某种权限
	 * 
	 * @param context
	 * @return
	 */
	private boolean hasPermission(Context context) {
		int permission = context
				.checkCallingOrSelfPermission(INTERNET_PERMISSION);
		return permission == PackageManager.PERMISSION_GRANTED;
	}
}